Module: Sequel::Plugins::ClassTableInheritance

### Home Classes Methods

### In Files

- lib/sequel/plugins/class_table_inheritance.rb

### Namespace

- MODULE Sequel::Plugins::ClassTableInheritance::ClassMethods
- MODULE Sequel::Plugins::ClassTableInheritance::InstanceMethods

### Methods

- ::apply
- ::configure

### Files

- CHANGELOG
- MIT-LICENSE
- README.rdoc
- active_record.rdoc
- advanced_associations.rdoc
- association_basics.rdoc
- bin_sequel.rdoc
- cheat_sheet.rdoc
- code_order.rdoc
- core_extensions.rdoc
- dataset_basics.rdoc
- dataset_filtering.rdoc
- extensions.rdoc
- mass_assignment.rdoc
- migration.rdoc
- model_hooks.rdoc
- model_plugins.rdoc
- mssql_stored_procedures.rdoc
- object_model.rdoc
- opening_databases.rdoc
- postgresql.rdoc
- prepared_statements.rdoc
- querying.rdoc
- reflection.rdoc
- 1.0.txt
- 1.1.txt
- 1.3.txt
- 1.4.0.txt
- 1.5.0.txt
- 2.0.0.txt
- 2.1.0.txt
- 2.10.0.txt
- 2.11.0.txt
- 2.12.0.txt
- 2.2.0.txt
- 2.3.0.txt
- 2.4.0.txt
- 2.5.0.txt
- 2.6.0.txt
- 2.7.0.txt
- 2.8.0.txt
- 2.9.0.txt
- 3.0.0.txt
- 3.1.0.txt
- 3.10.0.txt
- 3.11.0.txt
- 3.12.0.txt
- 3.13.0.txt
- 3.14.0.txt
- 3.15.0.txt
- 3.16.0.txt
- 3.17.0.txt
- 3.18.0.txt
- 3.19.0.txt
- 3.2.0.txt
- 3.20.0.txt
- 3.21.0.txt
- 3.22.0.txt
- 3.23.0.txt
- 3.24.0.txt
- 3.25.0.txt
- 3.26.0.txt
- 3.27.0.txt
- 3.28.0.txt
- 3.29.0.txt
- 3.3.0.txt
- 3.30.0.txt
- 3.31.0.txt
- 3.32.0.txt
- 3.33.0.txt
- 3.34.0.txt
- 3.35.0.txt
- 3.36.0.txt
- 3.37.0.txt
- 3.38.0.txt
- 3.39.0.txt
- 3.4.0.txt
- 3.40.0.txt
- 3.41.0.txt
- 3.42.0.txt
- 3.43.0.txt
- 3.44.0.txt
- 3.45.0.txt
- 3.46.0.txt
- 3.47.0.txt
- 3.48.0.txt
- 3.5.0.txt
- 3.6.0.txt
- 3.7.0.txt
- 3.8.0.txt
- 3.9.0.txt
- 4.0.0.txt
- 4.1.0.txt
- 4.10.0.txt
- 4.11.0.txt
- 4.12.0.txt
- 4.13.0.txt
- 4.14.0.txt
- 4.15.0.txt
- 4.16.0.txt
- 4.17.0.txt
- 4.18.0.txt
- 4.19.0.txt
- 4.2.0.txt
- 4.20.0.txt
- 4.21.0.txt
- 4.22.0.txt
- 4.23.0.txt
- 4.24.0.txt
- 4.25.0.txt
- 4.26.0.txt
- 4.3.0.txt
- 4.4.0.txt
- 4.5.0.txt
- 4.6.0.txt
- 4.7.0.txt
- 4.8.0.txt
- 4.9.0.txt
- schema_modification.rdoc
- security.rdoc
- sharding.rdoc
- sql.rdoc
- testing.rdoc
- thread_safety.rdoc
- transactions.rdoc
- validations.rdoc
- virtual_rows.rdoc

### Class/Module Index

Quicksearch

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- Sequel::JDBC::JavaLang
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- Sequel::MigrationAlterTableReverser
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- Sequel::ODBC
- Sequel::ODBC::Database
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- Sequel::ODBC::MSSQL::DatabaseMethods
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- Sequel::Oracle
- Sequel::Oracle::Database
- Sequel::Oracle::DatabaseMethods
- Sequel::Oracle::Dataset
- Sequel::Oracle::Dataset::ArgumentMapper
- Sequel::Oracle::DatasetMethods
- Sequel::Plugins
- Sequel::Plugins::AccessedColumns
- Sequel::Plugins::AccessedColumns::InstanceMethods
- Sequel::Plugins::ActiveModel
- Sequel::Plugins::ActiveModel::ClassMethods
- Sequel::Plugins::ActiveModel::Errors
- Sequel::Plugins::ActiveModel::InstanceMethods
- Sequel::Plugins::AfterInitialize
- Sequel::Plugins::AfterInitialize::ClassMethods
- Sequel::Plugins::AfterInitialize::InstanceMethods
- Sequel::Plugins::AssociationAutoreloading
- Sequel::Plugins::AssociationDependencies
- Sequel::Plugins::AssociationDependencies::ClassMethods
- Sequel::Plugins::AssociationDependencies::InstanceMethods
- Sequel::Plugins::AssociationPks
- Sequel::Plugins::AssociationPks::ClassMethods
- Sequel::Plugins::AssociationPks::InstanceMethods
- Sequel::Plugins::AssociationProxies
- Sequel::Plugins::AssociationProxies::AssociationProxy
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- Sequel::Plugins::AutoValidations
- Sequel::Plugins::AutoValidations::ClassMethods
- Sequel::Plugins::AutoValidations::InstanceMethods
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- Sequel::Plugins::BlacklistSecurity::ClassMethods
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- Sequel::Plugins::BlacklistSecurity::InstanceMethods::ExceptionList
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- Sequel::Plugins::BooleanReaders::ClassMethods
- Sequel::Plugins::Caching
- Sequel::Plugins::Caching::ClassMethods
- Sequel::Plugins::Caching::InstanceMethods
- Sequel::Plugins::ClassTableInheritance
- Sequel::Plugins::ClassTableInheritance::ClassMethods
- Sequel::Plugins::ClassTableInheritance::InstanceMethods
- Sequel::Plugins::ColumnConflicts
- Sequel::Plugins::ColumnConflicts::ClassMethods
- Sequel::Plugins::ColumnConflicts::InstanceMethods
- Sequel::Plugins::ColumnSelect
- Sequel::Plugins::ColumnSelect::ClassMethods
- Sequel::Plugins::Composition
- Sequel::Plugins::Composition::ClassMethods
- Sequel::Plugins::Composition::InstanceMethods
- Sequel::Plugins::ConstraintValidations
- Sequel::Plugins::ConstraintValidations::ClassMethods
- Sequel::Plugins::ConstraintValidations::DatabaseMethods
- Sequel::Plugins::ConstraintValidations::InstanceMethods
- Sequel::Plugins::CsvSerializer
- Sequel::Plugins::CsvSerializer::ClassMethods
- Sequel::Plugins::CsvSerializer::DatasetMethods
- Sequel::Plugins::CsvSerializer::InstanceMethods
- Sequel::Plugins::DatasetAssociations
- Sequel::Plugins::DatasetAssociations::ClassMethods
- Sequel::Plugins::DatasetAssociations::DatasetMethods
- Sequel::Plugins::DefaultsSetter
- Sequel::Plugins::DefaultsSetter::ClassMethods
- Sequel::Plugins::DefaultsSetter::InstanceMethods
- Sequel::Plugins::DelayAddAssociation
- Sequel::Plugins::DelayAddAssociation::InstanceMethods
- Sequel::Plugins::Dirty
- Sequel::Plugins::Dirty::InstanceMethods
- Sequel::Plugins::EagerEach
- Sequel::Plugins::EagerEach::DatasetMethods
- Sequel::Plugins::ErrorSplitter
- Sequel::Plugins::ErrorSplitter::InstanceMethods
- Sequel::Plugins::ForceEncoding
- Sequel::Plugins::ForceEncoding::ClassMethods
- Sequel::Plugins::ForceEncoding::InstanceMethods
- Sequel::Plugins::HookClassMethods
- Sequel::Plugins::HookClassMethods::ClassMethods
- Sequel::Plugins::HookClassMethods::InstanceMethods
- Sequel::Plugins::InputTransformer
- Sequel::Plugins::InputTransformer::ClassMethods
- Sequel::Plugins::InputTransformer::InstanceMethods
- Sequel::Plugins::InsertReturningSelect
- Sequel::Plugins::InsertReturningSelect::ClassMethods
- Sequel::Plugins::InsertReturningSelect::InstanceMethods
- Sequel::Plugins::InstanceFilters
- Sequel::Plugins::InstanceFilters::InstanceMethods
- Sequel::Plugins::InstanceHooks
- Sequel::Plugins::InstanceHooks::InstanceMethods
- Sequel::Plugins::InvertedSubsets
- Sequel::Plugins::InvertedSubsets::ClassMethods
- Sequel::Plugins::JsonSerializer
- Sequel::Plugins::JsonSerializer::ClassMethods
- Sequel::Plugins::JsonSerializer::DatasetMethods
- Sequel::Plugins::JsonSerializer::InstanceMethods
- Sequel::Plugins::JsonSerializer::Literal
- Sequel::Plugins::LazyAttributes
- Sequel::Plugins::LazyAttributes::ClassMethods
- Sequel::Plugins::LazyAttributes::InstanceMethods
- Sequel::Plugins::List
- Sequel::Plugins::List::ClassMethods
- Sequel::Plugins::List::InstanceMethods
- Sequel::Plugins::ManyThroughMany
- Sequel::Plugins::ManyThroughMany::ClassMethods
- Sequel::Plugins::ManyThroughMany::DatasetMethods
- Sequel::Plugins::ManyThroughMany::ManyThroughManyAssociationReflection
- Sequel::Plugins::ManyThroughMany::OneThroughManyAssociationReflection
- Sequel::Plugins::ManyToOnePkLookup
- Sequel::Plugins::ModificationDetection
- Sequel::Plugins::ModificationDetection::ClassMethods
- Sequel::Plugins::ModificationDetection::InstanceMethods
- Sequel::Plugins::MssqlOptimisticLocking
- Sequel::Plugins::MssqlOptimisticLocking::ClassMethods
- Sequel::Plugins::MssqlOptimisticLocking::InstanceMethods
- Sequel::Plugins::NestedAttributes
- Sequel::Plugins::NestedAttributes::ClassMethods
- Sequel::Plugins::NestedAttributes::InstanceMethods
- Sequel::Plugins::OptimisticLocking
- Sequel::Plugins::OptimisticLocking::ClassMethods
- Sequel::Plugins::OptimisticLocking::InstanceMethods
- Sequel::Plugins::PgArrayAssociations
- Sequel::Plugins::PgArrayAssociations::ClassMethods
- Sequel::Plugins::PgArrayAssociations::DatasetMethods
- Sequel::Plugins::PgArrayAssociations::ManyToPgArrayAssociationReflection
- Sequel::Plugins::PgArrayAssociations::PgArrayToManyAssociationReflection
- Sequel::Plugins::PgRow
- Sequel::Plugins::PgRow::ClassMethods
- Sequel::Plugins::PgRow::DatabaseMethods
- Sequel::Plugins::PgRow::InstanceMethods
- Sequel::Plugins::PgTypecastOnLoad
- Sequel::Plugins::PgTypecastOnLoad::ClassMethods
- Sequel::Plugins::PgTypecastOnLoad::InstanceMethods
- Sequel::Plugins::PreparedStatements
- Sequel::Plugins::PreparedStatements::ClassMethods
- Sequel::Plugins::PreparedStatements::InstanceMethods
- Sequel::Plugins::PreparedStatementsAssociations
- Sequel::Plugins::PreparedStatementsAssociations::InstanceMethods
- Sequel::Plugins::PreparedStatementsSafe
- Sequel::Plugins::PreparedStatementsSafe::ClassMethods
- Sequel::Plugins::PreparedStatementsSafe::InstanceMethods
- Sequel::Plugins::PreparedStatementsWithPk
- Sequel::Plugins::PreparedStatementsWithPk::ClassMethods
- Sequel::Plugins::PreparedStatementsWithPk::DatasetMethods
- Sequel::Plugins::RcteTree
- Sequel::Plugins::Schema
- Sequel::Plugins::Schema::ClassMethods
- Sequel::Plugins::Scissors
- Sequel::Plugins::Scissors::ClassMethods
- Sequel::Plugins::Serialization
- Sequel::Plugins::Serialization::ClassMethods
- Sequel::Plugins::Serialization::InstanceMethods
- Sequel::Plugins::SerializationModificationDetection
- Sequel::Plugins::SerializationModificationDetection::InstanceMethods
- Sequel::Plugins::Sharding
- Sequel::Plugins::Sharding::ClassMethods
- Sequel::Plugins::Sharding::DatasetMethods
- Sequel::Plugins::Sharding::InstanceMethods
- Sequel::Plugins::SingleTableInheritance
- Sequel::Plugins::SingleTableInheritance::ClassMethods
- Sequel::Plugins::SingleTableInheritance::InstanceMethods
- Sequel::Plugins::SingularTableNames
- Sequel::Plugins::SingularTableNames::ClassMethods
- Sequel::Plugins::SkipCreateRefresh
- Sequel::Plugins::SkipCreateRefresh::InstanceMethods
- Sequel::Plugins::SplitValues
- Sequel::Plugins::SplitValues::ClassMethods
- Sequel::Plugins::SplitValues::InstanceMethods
- Sequel::Plugins::StaticCache
- Sequel::Plugins::StaticCache::ClassMethods
- Sequel::Plugins::StaticCache::InstanceMethods
- Sequel::Plugins::StringStripper
- Sequel::Plugins::StringStripper::ClassMethods
- Sequel::Plugins::Subclasses
- Sequel::Plugins::Subclasses::ClassMethods
- Sequel::Plugins::TableSelect
- Sequel::Plugins::TableSelect::ClassMethods
- Sequel::Plugins::TacticalEagerLoading
- Sequel::Plugins::TacticalEagerLoading::DatasetMethods
- Sequel::Plugins::TacticalEagerLoading::InstanceMethods
- Sequel::Plugins::Timestamps
- Sequel::Plugins::Timestamps::ClassMethods
- Sequel::Plugins::Timestamps::InstanceMethods
- Sequel::Plugins::Touch
- Sequel::Plugins::Touch::ClassMethods
- Sequel::Plugins::Touch::InstanceMethods
- Sequel::Plugins::Tree
- Sequel::Plugins::Tree::ClassMethods
- Sequel::Plugins::Tree::InstanceMethods
- Sequel::Plugins::Tree::SingleRoot
- Sequel::Plugins::Tree::SingleRoot::ClassMethods
- Sequel::Plugins::Tree::SingleRoot::InstanceMethods
- Sequel::Plugins::Tree::TreeMultipleRootError
- Sequel::Plugins::TypecastOnLoad
- Sequel::Plugins::TypecastOnLoad::ClassMethods
- Sequel::Plugins::TypecastOnLoad::InstanceMethods
- Sequel::Plugins::UnlimitedUpdate
- Sequel::Plugins::UnlimitedUpdate::InstanceMethods
- Sequel::Plugins::UpdateOrCreate
- Sequel::Plugins::UpdateOrCreate::ClassMethods
- Sequel::Plugins::UpdatePrimaryKey
- Sequel::Plugins::UpdatePrimaryKey::InstanceMethods
- Sequel::Plugins::UpdateRefresh
- Sequel::Plugins::UpdateRefresh::ClassMethods
- Sequel::Plugins::UpdateRefresh::InstanceMethods
- Sequel::Plugins::ValidateAssociated
- Sequel::Plugins::ValidateAssociated::InstanceMethods
- Sequel::Plugins::ValidationClassMethods
- Sequel::Plugins::ValidationClassMethods::ClassMethods
- Sequel::Plugins::ValidationClassMethods::ClassMethods::Generator
- Sequel::Plugins::ValidationClassMethods::InstanceMethods
- Sequel::Plugins::ValidationHelpers
- Sequel::Plugins::ValidationHelpers::InstanceMethods
- Sequel::Plugins::XmlSerializer
- Sequel::Plugins::XmlSerializer::ClassMethods
- Sequel::Plugins::XmlSerializer::DatasetMethods
- Sequel::Plugins::XmlSerializer::InstanceMethods
- Sequel::Postgres
- Sequel::Postgres::Adapter
- Sequel::Postgres::AlterTableGenerator
- Sequel::Postgres::ArrayOp
- Sequel::Postgres::ArrayOpMethods
- Sequel::Postgres::CreateTableGenerator
- Sequel::Postgres::Database
- Sequel::Postgres::DatabaseMethods
- Sequel::Postgres::Dataset
- Sequel::Postgres::Dataset::ArgumentMapper
- Sequel::Postgres::DatasetMethods
- Sequel::Postgres::DatasetMethods::PreparedStatementMethods
- Sequel::Postgres::EnumDatabaseMethods
- Sequel::Postgres::ExclusionConstraintViolation
- Sequel::Postgres::HStore
- Sequel::Postgres::HStore::DatabaseMethods
- Sequel::Postgres::HStore::Parser
- Sequel::Postgres::HStoreOp
- Sequel::Postgres::HStoreOpMethods
- Sequel::Postgres::InetDatabaseMethods
- Sequel::Postgres::InetDatasetMethods
- Sequel::Postgres::InetOp
- Sequel::Postgres::InetOpMethods
- Sequel::Postgres::IntervalDatabaseMethods
- Sequel::Postgres::IntervalDatabaseMethods::Parser
- Sequel::Postgres::IntervalDatasetMethods
- Sequel::Postgres::JSONArray
- Sequel::Postgres::JSONArrayBase
- Sequel::Postgres::JSONBArray
- Sequel::Postgres::JSONBHash
- Sequel::Postgres::JSONBOp
- Sequel::Postgres::JSONBaseOp
- Sequel::Postgres::JSONDatabaseMethods
- Sequel::Postgres::JSONHash
- Sequel::Postgres::JSONHashBase
- Sequel::Postgres::JSONOp
- Sequel::Postgres::JSONOpMethods
- Sequel::Postgres::LooseCount
- Sequel::Postgres::PGArray
- Sequel::Postgres::PGArray::Creator
- Sequel::Postgres::PGArray::DatabaseMethods
- Sequel::Postgres::PGArray::JSONCreator
- Sequel::Postgres::PGArray::Parser
- Sequel::Postgres::PGRange
- Sequel::Postgres::PGRange::DatabaseMethods
- Sequel::Postgres::PGRange::DatasetMethods
- Sequel::Postgres::PGRange::Parser
- Sequel::Postgres::PGRow
- Sequel::Postgres::PGRow::ArrayRow
- Sequel::Postgres::PGRow::DatabaseMethods
- Sequel::Postgres::PGRow::HashRow
- Sequel::Postgres::PGRow::Parser
- Sequel::Postgres::PGRow::Splitter
- Sequel::Postgres::PGRowOp
- Sequel::Postgres::PGRowOp::ExpressionMethods
- Sequel::Postgres::RangeOp
- Sequel::Postgres::RangeOpMethods
- Sequel::Postgres::StaticCacheUpdater
- Sequel::PrettyTable
- Sequel::Progress
- Sequel::Progress::DatabaseMethods
- Sequel::Progress::DatasetMethods
- Sequel::Qualifier
- Sequel::QueryLiterals
- Sequel::SQL
- Sequel::SQL::AliasMethods
- Sequel::SQL::AliasedExpression
- Sequel::SQL::BitwiseMethods
- Sequel::SQL::Blob
- Sequel::SQL::BooleanConstant
- Sequel::SQL::BooleanExpression
- Sequel::SQL::BooleanMethods
- Sequel::SQL::Builders
- Sequel::SQL::CaseExpression
- Sequel::SQL::Cast
- Sequel::SQL::CastMethods
- Sequel::SQL::ColumnAll
- Sequel::SQL::ComplexExpression
- Sequel::SQL::ComplexExpressionMethods
- Sequel::SQL::Constant
- Sequel::SQL::Constants
- Sequel::SQL::DateAdd
- Sequel::SQL::DateAdd::DatasetMethods
- Sequel::SQL::DelayedEvaluation
- Sequel::SQL::Expression
- Sequel::SQL::Function
- Sequel::SQL::GenericExpression
- Sequel::SQL::Identifier
- Sequel::SQL::InequalityMethods
- Sequel::SQL::JoinClause
- Sequel::SQL::JoinOnClause
- Sequel::SQL::JoinUsingClause
- Sequel::SQL::NegativeBooleanConstant
- Sequel::SQL::NumericExpression
- Sequel::SQL::NumericMethods
- Sequel::SQL::OperatorBuilders
- Sequel::SQL::OrderMethods
- Sequel::SQL::OrderedExpression
- Sequel::SQL::PatternMatchMethods
- Sequel::SQL::PlaceholderLiteralString
- Sequel::SQL::QualifiedIdentifier
- Sequel::SQL::QualifyingMethods
- Sequel::SQL::StringConcatenationMethods
- Sequel::SQL::StringExpression
- Sequel::SQL::StringMethods
- Sequel::SQL::Subscript
- Sequel::SQL::SubscriptMethods
- Sequel::SQL::ValueList
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# Sequel::Plugins::ClassTableInheritance

# Overview

The class_table_inheritance plugin uses the single_table_inheritance plugin, so it supports all of the single_table_inheritance features, but it additionally supports subclasses that have additional columns, which are stored in a separate table with a key referencing the primary table.

# Detail

For example, with this hierarchy:

        Employee
       /        \
    Staff     Manager
      |          |
    Cook      Executive
                 |
                CEO

the following database schema may be used (table - columns):

employees | id, name, kind
staff | id, manager_id
managers | id, num_staff
executives | id, num_managers

The class_table_inheritance plugin assumes that the root table (e.g. employees) has a primary key column (usually autoincrementing), and all other tables have a foreign key of the same name that points to the same column in their superclass's table. In this example, the employees id column is a primary key and the id column in every other table is a foreign key referencing the employees id.

In this example the staff table also stores Cook model objects and the executives table also stores CEO model objects.

When using the class_table_inheritance plugin, subclasses that have additional columns use joined datasets:

    Employee.dataset.sql
    # SELECT * FROM employees

    Manager.dataset.sql
    # SELECT employees.id, employees.name, employees.kind,
    #        managers.num_staff
    # FROM employees
    # JOIN managers ON (managers.id = employees.id)

    CEO.dataset.sql
    # SELECT employees.id, employees.name, employees.kind,
    #        managers.num_staff, executives.num_managers
    # FROM employees
    # JOIN managers ON (managers.id = employees.id)
    # JOIN executives ON (executives.id = managers.id)
    # WHERE (employees.kind IN ('CEO'))

This allows CEO.all to return instances with all attributes loaded. The plugin overrides the deleting, inserting, and updating in the model to work with multiple tables, by handling each table individually.

# Subclass loading

When model objects are retrieved for a superclass the result can contain subclass instances that only have column entries for the columns in the superclass table. Calling the column method on the subclass instance for a column not in the superclass table will cause a query to the database to get the value for that column. If the subclass instance was retreived using Dataset#all, the query to the database will attempt to load the column values for all subclass instances that were retrieved. For example:

    a = Employee.all # [<#Staff>, <#Manager>, <#Executive>]
    a.first.values # {:id=>1, name=>'S', :kind=>'Staff'}
    a.first.manager_id # Loads the manager_id attribute from the database

If you want to get all columns in a subclass instance after loading via the superclass, call Model#refresh.

    a = Employee.first
    a.values # {:id=>1, name=>'S', :kind=>'CEO'}
    a.refresh.values # {:id=>1, name=>'S', :kind=>'Executive', :num_staff=>4, :num_managers=>2}

# Usage

    # Use the default of storing the class name in the sti_key
    # column (:kind in this case)
    class Employee < Sequel::Model
      plugin :class_table_inheritance, :key=>:kind
    end

    # Have subclasses inherit from the appropriate class
    class Staff < Employee; end    # uses staff table
    class Cook < Staff; end        # cooks table doesn't exist so uses staff table
    class Manager < Employee; end  # uses managers table
    class Executive < Manager; end # uses executives table
    class CEO < Executive; end     # ceos table doesn't exist so uses executives table

    # Some examples of using these options:

    # Specifying the tables with a :table_map hash
    Employee.plugin :class_table_inheritance,
      :table_map=>{:Employee  => :employees,
                   :Staff     => :staff,
                   :Cook      => :staff,
                   :Manager   => :managers,
                   :Executive => :executives,
                   :CEO       => :executives }

    # Using integers to store the class type, with a :model_map hash
    # and an sti_key of :type
    Employee.plugin :class_table_inheritance, :type,
      :model_map=>{1=>:Staff, 2=>:Cook, 3=>:Manager, 4=>:Executive, 5=>:CEO}

    # Using non-class name strings
    Employee.plugin :class_table_inheritance, :key=>:type,
      :model_map=>{'staff'=>:Staff, 'cook staff'=>:Cook, 'supervisor'=>:Manager}

    # By default the plugin sets the respective column value
    # when a new instance is created.
    Cook.create.type == 'cook staff'
    Manager.create.type == 'supervisor'

    # You can customize this behavior with the :key_chooser option.
    # This is most useful when using a non-bijective mapping.
    Employee.plugin :class_table_inheritance, :key=>:type,
      :model_map=>{'cook staff'=>:Cook, 'supervisor'=>:Manager},
      :key_chooser=>proc{|instance| instance.model.sti_key_map[instance.model.to_s].first || 'stranger' }

    # Using custom procs, with :model_map taking column values
    # and yielding either a class, string, symbol, or nil,
    # and :key_map taking a class object and returning the column
    # value to use
    Employee.plugin :single_table_inheritance, :key=>:type,
      :model_map=>proc{|v| v.reverse},
      :key_map=>proc{|klass| klass.name.reverse}

    # You can use the same class for multiple values.
    # This is mainly useful when the sti_key column contains multiple values
    # which are different but do not require different code.
    Employee.plugin :single_table_inheritance, :key=>:type,
      :model_map=>{'staff' => "Staff",
                   'manager' => "Manager",
                   'overpayed staff' => "Staff",
                   'underpayed staff' => "Staff"}

One minor issue to note is that if you specify the `:key_map` option as a hash, instead of having it inferred from the `:model_map`, you should only use class name strings as keys, you should not use symbols as keys.

### Public Class Methods

apply(model, opts = OPTS) click to toggle source

The class_table_inheritance plugin requires the single_table_inheritance plugin and the lazy_attributes plugin to handle lazily-loaded attributes for subclass instances returned by superclass methods.

    # File lib/sequel/plugins/class_table_inheritance.rb, line 156
    def self.apply(model, opts = OPTS)
      model.plugin :single_table_inheritance, nil
      model.plugin :lazy_attributes
    end

configure(model, opts = OPTS) click to toggle source

Initialize the plugin using the following options:

:key | Column symbol that holds the key that identifies the class to use. Necessary if you want to call model methods on a superclass that return subclass instances
:model_map | Hash or proc mapping the key column values to model class names.
:key_map | Hash or proc mapping model class names to key column values. Each value or return is an array of possible key column values.
:key_chooser | proc returning key for the provided model instance
:table_map | Hash with class name symbols keys mapping to table name symbol values Overrides implicit table names

    # File lib/sequel/plugins/class_table_inheritance.rb, line 171
    def self.configure(model, opts = OPTS)
      SingleTableInheritance.configure model, opts[:key], opts

      model.instance_eval do
        @cti_models = [self]
        @cti_tables = [table_name]
        @cti_instance_dataset = @instance_dataset
        @cti_table_columns = columns
        @cti_table_map = opts[:table_map] || {}
      end
    end

[Validate]

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